A gel polymer electrolyte according to the present invention comprises a polymer selected from the group consisting of vinyl acetate copolymer, poly(ethylene/vinylacetate/carbon oxide: EVACM), and poly(ethylene/vinylacetate/maleic acid anhydride: EVAMA); an inorganic filler; and a liquid electrolyte...http://www.google.es/patents/US6268088?utm_source=gb-gplus-sharePatente US6268088 - Gel polymer electrolyte of vinyl acetate
